The WOMPO listserv pioneered by Annie Finch in December 1997.
Here is the original introduction from the original WOMPO website (now defunct).
Wompo is a listserv devoted to the discussion of Women’s Poetry. Membership is open to all individuals who are interested in discussing poetry written by women. Information about joining the discussion can be found here.
Wompo Publications and Events
Another source of information on women poets is the Mezzo Cammin Women Poets Timeline, founded by Wom-Po Kim Bridgford.